US4517548A - Transmitter/receiver circuit for signal transmission over power wiring - Google Patents

Transmitter/receiver circuit for signal transmission over power wiring Download PDF

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Publication number
US4517548A
US4517548A US06/451,019 US45101982A US4517548A US 4517548 A US4517548 A US 4517548A US 45101982 A US45101982 A US 45101982A US 4517548 A US4517548 A US 4517548A
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United States
Prior art keywords
circuit
distribution line
output
power wiring
fed
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Expired - Lifetime
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US06/451,019
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Masahiro Ise
Katsuyuki Machino
Hidehiko Tanaka
Toshiyuki Matsubara
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Sharp Corp
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Sharp Corp
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Priority to US06/451,019 priority Critical patent/US4517548A/en
Assigned to SHARP KABUSHIKI KAISHA reassignment SHARP KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ISE, MASAHIRO, MACHINO, KATSUYUKI, MATSUBARA, TOSHIYUKI, TANAKA, HIDEHIKO
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
    • H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5458—Monitor sensor; Alarm systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5483—Systems for power line communications using coupling circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5491—Systems for power line communications using filtering and bypassing

Definitions

  • This invention is in relation to a transmitter/receiver circuit for signal transmission over power wiring.
  • the lower the output impedance the better, for effective superimposing of signals on the distribution line.
  • attachment of low impedance loads to the distribution line should be prevented and carrier leakages due to the efffects of high level noise (thyristor noise etc.) on the input side must also be prevented during transmission breaks.
  • higher input impedance is better, from the standpoint of the receiving section, to prevent drops in signal level at the receiving point and also to prevent loading when a number of receiving units are connected.
  • the present invention has taken the above mentioned points into consideration and is a system in which the problems in previous equipment have been resolved.
  • the present invention offers a transmitter/receiver circuit for power wiring which consists of a power wiring transmitter section in which the output from a sine wave oscillator is fed to an emitter-follower through a photocoupler and, after passing this output through a step-down transformer, is connected to the indoor distribution lines through a series resonance circuit; and a receiving section in which the signals are fed to a parallel resonance circuit from the indoor distribution line through a series resonance circuit. Moreover, the input and output sections are resistance terminated.
  • FIG. 1 is a diagram of the electrical circuit of the transmitter circuit in an example of the present invention in operation
  • FIGS. 2(a) and (b) are time charts showing examples of various types of noise
  • FIGS. 3(a) and (b) are diagrams showing alternatives to photocoupler 2 in FIG. 1,
  • FIG. 4 is a diagram showing an example of the filter circuit in the receiver unit
  • FIG. 5 is a diagram showing an example of the filter of FIG. 4, inductance-coupled to increase the level, and
  • FIG. 6 is a block diagram showing the outline of the receiving system.
  • FIG. 1 is the electrical circuit of the transmitter.
  • This circuit includes sine wave oscillator circuit 1, photocoupler (2-directional FET type) 2, current limiting resistor 3 for the photocoupler LED, transistor 4 that controls the LED by an ON-OFF signal from the control section (microcomputer etc.), emitter-follower transistors 5 and 6 for lowering the impedance, decoupling capacitor 7, step-down transformer 8 (n:1) to further lower impedance, series resonance circuits 9 and 10 to isolate the distribution line voltage and feed the carrier to the distribution line at a low impedance, power supply 11, and high level distribution line noise suppression diodes 12 and 13.
  • Step-down transformer 8 is therefore inserted between the emitter-follower and the distribution line and the desired impedance obtained by setting the output impedance to 1/n 2 (n is the turns ratio). It will be necessary to generate a signal of n times the final level with the sine wave oscillator circuit for the output voltage to also be 1/n. However, it will serve no purpose even if the impedance applied to stepdown transformer 8 is lowered if the impedance at the connection to the distribution line remains high.
  • capacitor 9 and coil 10 are inserted in the form of a series resonance circuit at the connection where only a capacitor is used normally.
  • operation during transmission is as explained above, consideration of the circuit operation during transmission breaks is also necessary.
  • various types of noise will be mixed on the line.
  • the principal types will be thyristor noise (FIG. 2(a)) and motor brush noise (vacuum cleaners etc., FIG. 2(b)).
  • These noise levels reach a maximum of 30 V pp for thyristor and 2 V pp for vacuum cleaners.
  • These noise frequencies pass through the series resonance circuit 9, 10 and are added to the base of emitter-follower 5, 6 after being stepped up through transformer 8.
  • photocoupler 2 acts as an isolating analog switch
  • the emitter-follower will be in a completely isolated OFF state and will therefore not load the distribution line as its output impedance is high.
  • the secondary impedance of step-down transformer 8 will be the direct load during the OFF state, there will therefore be no significant problem if a sufficiently high impedance (over 1 mH) is selected.
  • a sufficiently high impedance over 1 mH
  • photo transistors (2 sets used to obtain 2-way characteristics) connected as shown in FIG. 3(a) and (b) and CDS can also be used for photocoupler 2.
  • Photothyristors are not suitable as they are turned ON easily but require additional circuitry to turn OFF and as their switching speed is slow.
  • the characteristic impedance determines the impedance at the input and output sections of the filter and can be arbitrarily selected by means of C 1 , C 2 , L 1 and L 2 . However, if we select 1k ohm for example to disregard the load effect, the anticipated filter characteristics will not be obtained as it will be extremely mismatched with a line impedance of only about 2 to 5 ohm.
  • resistors R 1 and R 2 have been inserted to match the input/output sections with the characteristic impedance.
  • Z 0 . . distribution line impedance and also Z 0 , input impedance of the next stage input impedance of the next stage (inputs to emitter-follower, MOS etc.), the following can be selected.
  • the receiving level in this condition will be 1/2 the level on the distribution line.
  • n 2 R 2 may be repositioned in the secondary at this time, its equivalent value must be n 2 R 2 .
  • Demodulation is carried out by means of an amplifier and level detector connected after the filter. In FIG. 6, 14 is the filter, 15 the amplifier and 16 the level detector.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

A system transmits and receives control signals for various types of indoor devices using the existing power wiring in houses and buildings. The transmitter section of the power wiring transmission system is provided with a circuit in which the output of a sine wave oscillator is fed to an emitter-follower through a photocoupler and this output is then fed to the indoor power distribution line through a series resonance circuit after stepping down with a transformer; and the receiving section is provided with a circuit in which the signal from the distribution line is fed to a parallel resonance circuit after passing through a series resonance circuit. Moreover, the input and output sections are resistor terminated.

Description

BACKGROUND OF THE INVENTION
This invention is in relation to a transmitter/receiver circuit for signal transmission over power wiring.
In the transmitting section of such a power wiring transmission system, the lower the output impedance, the better, for effective superimposing of signals on the distribution line. However, attachment of low impedance loads to the distribution line should be prevented and carrier leakages due to the efffects of high level noise (thyristor noise etc.) on the input side must also be prevented during transmission breaks. On the one hand, higher input impedance is better, from the standpoint of the receiving section, to prevent drops in signal level at the receiving point and also to prevent loading when a number of receiving units are connected.
SUMMARY OF THE INVENTION
The present invention has taken the above mentioned points into consideration and is a system in which the problems in previous equipment have been resolved.
To attain the above objectives, the present invention offers a transmitter/receiver circuit for power wiring which consists of a power wiring transmitter section in which the output from a sine wave oscillator is fed to an emitter-follower through a photocoupler and, after passing this output through a step-down transformer, is connected to the indoor distribution lines through a series resonance circuit; and a receiving section in which the signals are fed to a parallel resonance circuit from the indoor distribution line through a series resonance circuit. Moreover, the input and output sections are resistance terminated.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram of the electrical circuit of the transmitter circuit in an example of the present invention in operation;
FIGS. 2(a) and (b) are time charts showing examples of various types of noise,
FIGS. 3(a) and (b) are diagrams showing alternatives to photocoupler 2 in FIG. 1,
FIG. 4 is a diagram showing an example of the filter circuit in the receiver unit,
FIG. 5 is a diagram showing an example of the filter of FIG. 4, inductance-coupled to increase the level, and
FIG. 6 is a block diagram showing the outline of the receiving system.
DETAILED DESCRIPTION OF THE INVENTION
We shall first start by describing the transmitter. FIG. 1 is the electrical circuit of the transmitter. This circuit includes sine wave oscillator circuit 1, photocoupler (2-directional FET type) 2, current limiting resistor 3 for the photocoupler LED, transistor 4 that controls the LED by an ON-OFF signal from the control section (microcomputer etc.), emitter-follower transistors 5 and 6 for lowering the impedance, decoupling capacitor 7, step-down transformer 8 (n:1) to further lower impedance, series resonance circuits 9 and 10 to isolate the distribution line voltage and feed the carrier to the distribution line at a low impedance, power supply 11, and high level distribution line noise suppression diodes 12 and 13.
Although the output impedance of normal transistor emitter-followers (5 and 6 in the diagram) is about 15 ohm, this is not satisfactory, as the distribution line impedance is only about 2 to 5 ohm. Step-down transformer 8 is therefore inserted between the emitter-follower and the distribution line and the desired impedance obtained by setting the output impedance to 1/n2 (n is the turns ratio). It will be necessary to generate a signal of n times the final level with the sine wave oscillator circuit for the output voltage to also be 1/n. However, it will serve no purpose even if the impedance applied to stepdown transformer 8 is lowered if the impedance at the connection to the distribution line remains high. For this reason capacitor 9 and coil 10 are inserted in the form of a series resonance circuit at the connection where only a capacitor is used normally. Although operation during transmission is as explained above, consideration of the circuit operation during transmission breaks is also necessary. As various devices are generally connected to the distribution line, various types of noise will be mixed on the line. The principal types will be thyristor noise (FIG. 2(a)) and motor brush noise (vacuum cleaners etc., FIG. 2(b)). These noise levels reach a maximum of 30 Vpp for thyristor and 2 Vpp for vacuum cleaners. These noise frequencies pass through the series resonance circuit 9, 10 and are added to the base of emitter-follower 5, 6 after being stepped up through transformer 8.
However, as photocoupler 2 acts as an isolating analog switch, the emitter-follower will be in a completely isolated OFF state and will therefore not load the distribution line as its output impedance is high. Although the secondary impedance of step-down transformer 8 will be the direct load during the OFF state, there will therefore be no significant problem if a sufficiently high impedance (over 1 mH) is selected. Also, as the control of the analog switch is completely isolated from the switch, there will be no adverse effects even if there is line noise present on the base.
As the switch and control parts are not completely isolated in normal analog switches (transistors, FET's, CMOS's etc.), in essence, carrier leakage to the distribution line will occur for ON commands issued by the control section when the level at point A (base of emitter-follower 5, 6) becomes momentarily high or low. If point A is grounded through a resistor or capacitor in an attempt to prevent this, a low impedance load will be presented to the distribution line as emitter-follower 5, 6 will not be completely isolated. As each power wiring transmission section is normally made up of a transmitter/receiver pair, the load during OFF periods of the transmitter is undesirable when a large number of units are connected for answer back service on the assumption of improved reliability. This invention completely resolves the abovementioned problems.
Instead of the 2-way FET shown in FIG. 1, photo transistors (2 sets used to obtain 2-way characteristics) connected as shown in FIG. 3(a) and (b) and CDS can also be used for photocoupler 2. Photothyristors are not suitable as they are turned ON easily but require additional circuitry to turn OFF and as their switching speed is slow.
We shall now explain the receiving section. In power wiring transmission using an AM system, data transmission is carried out by turning a special carrier frequency ON and OFF. To block the distribution line voltage and effectively remove the noise elements, the narrower the band width of the filter used, the better the results. Better results are also obtained with higher input impedance at the receiving point to prevent attenuation of the signal and to prevent loading when a number of receiving circuits are connected. Although a signal tuning circuit is normally used in this section, this will not be suitable here considering the foregoing problems. As shown in FIG. 4, this example uses a series resonance circuit composed of capacitor C1 and coil L1 as a filter at the connection to the distribution line and a parallel resonance circuit composed of capacitor C2 and coil L2 on the load side. If the circuit within the dotted lines in FIG. 4 satisfies the following condition, it can be treated a a constant-K filter and this simplifies design.
C.sub.1 L.sub.1 =C.sub.2 L.sub.2                           (1)
The various parameters of the filter may be obtained as follows. ##EQU1##
The characteristic impedance determines the impedance at the input and output sections of the filter and can be arbitrarily selected by means of C1, C2, L1 and L2. However, if we select 1k ohm for example to disregard the load effect, the anticipated filter characteristics will not be obtained as it will be extremely mismatched with a line impedance of only about 2 to 5 ohm. In this invention, resistors R1 and R2 have been inserted to match the input/output sections with the characteristic impedance. When Z0 . . distribution line impedance and also Z0 , , input impedance of the next stage (inputs to emitter-follower, MOS etc.), the following can be selected.
R.sub.1 =R.sub.2 =Z.sub.0                                  (5)
The receiving level in this condition will be 1/2 the level on the distribution line.
If a coil with ratio 1:n is added as shown in FIG. 5 to isolate the portion following the output of the filter from the distribution line and also to give additional voltage gain, a receiving level of n/2 will be realized. Although R2 may be repositioned in the secondary at this time, its equivalent value must be n2 R2. Demodulation is carried out by means of an amplifier and level detector connected after the filter. In FIG. 6, 14 is the filter, 15 the amplifier and 16 the level detector.

Claims (1)

What is claimed is:
1. A transmitter/receiver circuit for power wiring transmission system comprising a transmitting circuit in which the output of a sine wave oscillator is fed to an emitter-follower through a photocoupler and this output is then fed to the indoor distribution line through a series resonance circuit after passing through a step-down transformer; and a receiving circuit in which the signal from the distribution line is fed to a parallel resonance circuit after passing through a series resonance circuit and that the input and output sections are resistor terminated.
US06/451,019 1982-12-20 1982-12-20 Transmitter/receiver circuit for signal transmission over power wiring Expired - Lifetime US4517548A (en)

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646962A (en) * 1983-10-12 1987-03-03 Grant Willie T Rotational means for automatic damper means
US4672280A (en) * 1983-12-27 1987-06-09 Casio Computer Co., Ltd. Mobile robot calling system
US4800508A (en) * 1986-06-30 1989-01-24 Eaton Corporation Frequency detector
US4912553A (en) * 1986-03-28 1990-03-27 Pal Theodore L Wideband video system for single power line communications
WO1992021180A1 (en) * 1991-05-10 1992-11-26 Echelon Corporation Power line coupling network
US5929750A (en) * 1992-10-22 1999-07-27 Norweb Plc Transmission network and filter therefor
US5949327A (en) * 1994-08-26 1999-09-07 Norweb Plc Coupling of telecommunications signals to a balanced power distribution network
US6144292A (en) * 1992-10-22 2000-11-07 Norweb Plc Powerline communications network employing TDMA, FDMA and/or CDMA
DE10012235A1 (en) * 2000-03-14 2001-06-21 Siemens Ag Circuit for data transfer on power supply lines of electrical power supply network - with optocouplers to couple to power supply line, one in reception path and one in transmit path
US6282405B1 (en) 1992-10-22 2001-08-28 Norweb Plc Hybrid electricity and telecommunications distribution network
US20020110311A1 (en) * 2001-02-14 2002-08-15 Kline Paul A. Apparatus and method for providing a power line communication device for safe transmission of high-frequency, high-bandwidth signals over existing power distribution lines
US20020110310A1 (en) * 2001-02-14 2002-08-15 Kline Paul A. Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line
US6549120B1 (en) 2000-11-24 2003-04-15 Kinectrics Inc. Device for sending and receiving data through power distribution transformers
US20030179080A1 (en) * 2001-12-21 2003-09-25 Mollenkopf James Douglas Facilitating communication of data signals on electric power systems
US20040003934A1 (en) * 2002-06-24 2004-01-08 Cope Leonard David Power line coupling device and method of using the same
US20040135676A1 (en) * 2002-12-10 2004-07-15 Berkman William H. Power line communication system and method of operating the same
US20050020232A1 (en) * 2003-07-24 2005-01-27 Bonicatto Damian G. Data communication over power lines
US20050017847A1 (en) * 2003-07-24 2005-01-27 Bonicatto Damian G. Power line communication system having time server
US20050055586A1 (en) * 2003-07-24 2005-03-10 Hunt Technologies, Inc. Endpoint event processing system
US20050083925A1 (en) * 2003-07-24 2005-04-21 Bonicatto Damian G. Locating endpoints in a power line communication system
US6933835B2 (en) 2001-02-14 2005-08-23 Current Technologies, Llc Data communication over a power line
US6965303B2 (en) 2002-12-10 2005-11-15 Current Technologies, Llc Power line communication system and method
US6965302B2 (en) 2000-04-14 2005-11-15 Current Technologies, Llc Power line communication system and method of using the same
US6977578B2 (en) 2000-01-20 2005-12-20 Current Technologies, Llc Method of isolating data in a power line communications network
US6980089B1 (en) 2000-08-09 2005-12-27 Current Technologies, Llc Non-intrusive coupling to shielded power cable
US6980091B2 (en) 2002-12-10 2005-12-27 Current Technologies, Llc Power line communication system and method of operating the same
US6980090B2 (en) 2002-12-10 2005-12-27 Current Technologies, Llc Device and method for coupling with electrical distribution network infrastructure to provide communications
US6998962B2 (en) 2000-04-14 2006-02-14 Current Technologies, Llc Power line communication apparatus and method of using the same
US7046124B2 (en) 2003-01-21 2006-05-16 Current Technologies, Llc Power line coupling device and method of using the same
US7075414B2 (en) 2003-05-13 2006-07-11 Current Technologies, Llc Device and method for communicating data signals through multiple power line conductors
US7076378B1 (en) 2002-11-13 2006-07-11 Current Technologies, Llc Device and method for providing power line characteristics and diagnostics
US7102478B2 (en) 2002-06-21 2006-09-05 Current Technologies, Llc Power line coupling device and method of using the same
US7113134B1 (en) 2004-03-12 2006-09-26 Current Technologies, Llc Transformer antenna device and method of using the same
US7132819B1 (en) 2002-11-12 2006-11-07 Current Technologies, Llc Floating power supply and method of using the same
US20070002772A1 (en) * 2005-04-04 2007-01-04 Berkman William H Power Line Communication Device and Method
US7308103B2 (en) 2003-05-08 2007-12-11 Current Technologies, Llc Power line communication device and method of using the same
US20070287405A1 (en) * 2006-06-09 2007-12-13 Radtke William O Method and Device for Providing Broadband Over Power Line Communications
US20080056338A1 (en) * 2006-08-28 2008-03-06 David Stanley Yaney Power Line Communication Device and Method with Frequency Shifted Modem
US7460467B1 (en) 2003-07-23 2008-12-02 Current Technologies, Llc Voice-over-IP network test device and method
US20100111199A1 (en) * 2008-11-06 2010-05-06 Manu Sharma Device and Method for Communicating over Power Lines
US20100109862A1 (en) * 2008-11-06 2010-05-06 Manu Sharma System, Device and Method for Communicating over Power Lines
US8279058B2 (en) 2008-11-06 2012-10-02 Current Technologies International Gmbh System, device and method for communicating over power lines
US20190334581A1 (en) * 2014-07-22 2019-10-31 Esker Technologies, LLC Transient and spurious signal filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229184A (en) * 1963-03-11 1966-01-11 United Aircraft Corp Power supply filter circuit
US3878322A (en) * 1970-04-21 1975-04-15 Skiatron Elect & Tele Interrogated system
US4180804A (en) * 1977-06-02 1979-12-25 Hochiki Corporation Remote control device for an amplifier trap circuit
US4408185A (en) * 1978-11-13 1983-10-04 Elsmark A/S Process for transferring information and system for carrying out the process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229184A (en) * 1963-03-11 1966-01-11 United Aircraft Corp Power supply filter circuit
US3878322A (en) * 1970-04-21 1975-04-15 Skiatron Elect & Tele Interrogated system
US4180804A (en) * 1977-06-02 1979-12-25 Hochiki Corporation Remote control device for an amplifier trap circuit
US4408185A (en) * 1978-11-13 1983-10-04 Elsmark A/S Process for transferring information and system for carrying out the process

Cited By (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646962A (en) * 1983-10-12 1987-03-03 Grant Willie T Rotational means for automatic damper means
US4672280A (en) * 1983-12-27 1987-06-09 Casio Computer Co., Ltd. Mobile robot calling system
US4912553A (en) * 1986-03-28 1990-03-27 Pal Theodore L Wideband video system for single power line communications
US4800508A (en) * 1986-06-30 1989-01-24 Eaton Corporation Frequency detector
WO1992021180A1 (en) * 1991-05-10 1992-11-26 Echelon Corporation Power line coupling network
US5485040A (en) * 1991-05-10 1996-01-16 Echelon Corporation Powerline coupling network
US6172597B1 (en) 1992-10-22 2001-01-09 Norweb Plc Electricity distribution and/or power transmission network and filter for telecommunication over power lines
US6144292A (en) * 1992-10-22 2000-11-07 Norweb Plc Powerline communications network employing TDMA, FDMA and/or CDMA
US5933071A (en) * 1992-10-22 1999-08-03 Norweb Plc Electricity distribution and/or power transmission network and filter for telecommunication over power lines
US6282405B1 (en) 1992-10-22 2001-08-28 Norweb Plc Hybrid electricity and telecommunications distribution network
US5929750A (en) * 1992-10-22 1999-07-27 Norweb Plc Transmission network and filter therefor
US5949327A (en) * 1994-08-26 1999-09-07 Norweb Plc Coupling of telecommunications signals to a balanced power distribution network
US6977578B2 (en) 2000-01-20 2005-12-20 Current Technologies, Llc Method of isolating data in a power line communications network
DE10012235A1 (en) * 2000-03-14 2001-06-21 Siemens Ag Circuit for data transfer on power supply lines of electrical power supply network - with optocouplers to couple to power supply line, one in reception path and one in transmit path
DE10012235C2 (en) * 2000-03-14 2001-12-20 Siemens Ag Circuit arrangement for data transmission on the energy supply lines of an electrical energy supply network
US7245212B2 (en) 2000-04-14 2007-07-17 Current Technologies, Llc Power line communication apparatus and method of using the same
US6998962B2 (en) 2000-04-14 2006-02-14 Current Technologies, Llc Power line communication apparatus and method of using the same
US6965302B2 (en) 2000-04-14 2005-11-15 Current Technologies, Llc Power line communication system and method of using the same
US6980089B1 (en) 2000-08-09 2005-12-27 Current Technologies, Llc Non-intrusive coupling to shielded power cable
US6549120B1 (en) 2000-11-24 2003-04-15 Kinectrics Inc. Device for sending and receiving data through power distribution transformers
US20020110311A1 (en) * 2001-02-14 2002-08-15 Kline Paul A. Apparatus and method for providing a power line communication device for safe transmission of high-frequency, high-bandwidth signals over existing power distribution lines
US7218219B2 (en) 2001-02-14 2007-05-15 Current Technologies, Llc Data communication over a power line
US7103240B2 (en) 2001-02-14 2006-09-05 Current Technologies, Llc Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line
US6933835B2 (en) 2001-02-14 2005-08-23 Current Technologies, Llc Data communication over a power line
US6950567B2 (en) 2001-02-14 2005-09-27 Current Technologies, Llc Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line
US7453352B2 (en) 2001-02-14 2008-11-18 Current Technologies, Llc Data communication over a power line
US20020110310A1 (en) * 2001-02-14 2002-08-15 Kline Paul A. Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line
US7042351B2 (en) 2001-02-14 2006-05-09 Current Technologies, Llc Data communication over a power line
US7053756B2 (en) 2001-12-21 2006-05-30 Current Technologies, Llc Facilitating communication of data signals on electric power systems
US20030179080A1 (en) * 2001-12-21 2003-09-25 Mollenkopf James Douglas Facilitating communication of data signals on electric power systems
US7102478B2 (en) 2002-06-21 2006-09-05 Current Technologies, Llc Power line coupling device and method of using the same
US20040003934A1 (en) * 2002-06-24 2004-01-08 Cope Leonard David Power line coupling device and method of using the same
US7224243B2 (en) 2002-06-24 2007-05-29 Current Technologies, Llc Power line coupling device and method of using the same
US20060012449A1 (en) * 2002-06-24 2006-01-19 Cope Leonard D Power line coupling device and method of using the same
US6982611B2 (en) 2002-06-24 2006-01-03 Current Technologies, Llc Power line coupling device and method of using the same
US7132819B1 (en) 2002-11-12 2006-11-07 Current Technologies, Llc Floating power supply and method of using the same
US7076378B1 (en) 2002-11-13 2006-07-11 Current Technologies, Llc Device and method for providing power line characteristics and diagnostics
US6965303B2 (en) 2002-12-10 2005-11-15 Current Technologies, Llc Power line communication system and method
US7064654B2 (en) 2002-12-10 2006-06-20 Current Technologies, Llc Power line communication system and method of operating the same
US7701325B2 (en) 2002-12-10 2010-04-20 Current Technologies, Llc Power line communication apparatus and method of using the same
US6980091B2 (en) 2002-12-10 2005-12-27 Current Technologies, Llc Power line communication system and method of operating the same
US6980090B2 (en) 2002-12-10 2005-12-27 Current Technologies, Llc Device and method for coupling with electrical distribution network infrastructure to provide communications
US20040135676A1 (en) * 2002-12-10 2004-07-15 Berkman William H. Power line communication system and method of operating the same
US7301440B2 (en) 2002-12-10 2007-11-27 Current Technologies, Llc Power line communication system and method
US7250848B2 (en) 2002-12-10 2007-07-31 Current Technologies, Llc Power line communication apparatus and method of using the same
US7046124B2 (en) 2003-01-21 2006-05-16 Current Technologies, Llc Power line coupling device and method of using the same
US7308103B2 (en) 2003-05-08 2007-12-11 Current Technologies, Llc Power line communication device and method of using the same
US7075414B2 (en) 2003-05-13 2006-07-11 Current Technologies, Llc Device and method for communicating data signals through multiple power line conductors
US7460467B1 (en) 2003-07-23 2008-12-02 Current Technologies, Llc Voice-over-IP network test device and method
US20050055586A1 (en) * 2003-07-24 2005-03-10 Hunt Technologies, Inc. Endpoint event processing system
US7742393B2 (en) 2003-07-24 2010-06-22 Hunt Technologies, Inc. Locating endpoints in a power line communication system
US20070126571A1 (en) * 2003-07-24 2007-06-07 Hunt Technologies, Inc. Power line communication system having time server
US7236765B2 (en) 2003-07-24 2007-06-26 Hunt Technologies, Inc. Data communication over power lines
US20050020232A1 (en) * 2003-07-24 2005-01-27 Bonicatto Damian G. Data communication over power lines
US7180412B2 (en) * 2003-07-24 2007-02-20 Hunt Technologies, Inc. Power line communication system having time server
US20070229305A1 (en) * 2003-07-24 2007-10-04 Bonicatto Damian G Data Communication Over Power Lines
US20070018850A1 (en) * 2003-07-24 2007-01-25 Hunt Technologies, Inc. Endpoint event processing system
US9998173B2 (en) 2003-07-24 2018-06-12 Landis+Gyr Technologies, Llc Data communication over power lines
US7791468B2 (en) 2003-07-24 2010-09-07 Hunt Technologies, Inc. Power line communication system having time server
US20050017847A1 (en) * 2003-07-24 2005-01-27 Bonicatto Damian G. Power line communication system having time server
US7432824B2 (en) 2003-07-24 2008-10-07 Hunt Technologies, Inc. Endpoint event processing system
US7145438B2 (en) 2003-07-24 2006-12-05 Hunt Technologies, Inc. Endpoint event processing system
US20050083925A1 (en) * 2003-07-24 2005-04-21 Bonicatto Damian G. Locating endpoints in a power line communication system
US20090140880A1 (en) * 2003-07-24 2009-06-04 Hunt Technologies, Inc. Endpoint Event Processing System
US7113134B1 (en) 2004-03-12 2006-09-26 Current Technologies, Llc Transformer antenna device and method of using the same
US7804763B2 (en) 2005-04-04 2010-09-28 Current Technologies, Llc Power line communication device and method
US20070002772A1 (en) * 2005-04-04 2007-01-04 Berkman William H Power Line Communication Device and Method
US7671701B2 (en) 2006-06-09 2010-03-02 Current Technologies, Llc Method and device for providing broadband over power line communications
US20070287405A1 (en) * 2006-06-09 2007-12-13 Radtke William O Method and Device for Providing Broadband Over Power Line Communications
US20080056338A1 (en) * 2006-08-28 2008-03-06 David Stanley Yaney Power Line Communication Device and Method with Frequency Shifted Modem
US20100111199A1 (en) * 2008-11-06 2010-05-06 Manu Sharma Device and Method for Communicating over Power Lines
US20100109862A1 (en) * 2008-11-06 2010-05-06 Manu Sharma System, Device and Method for Communicating over Power Lines
US8188855B2 (en) 2008-11-06 2012-05-29 Current Technologies International Gmbh System, device and method for communicating over power lines
US8279058B2 (en) 2008-11-06 2012-10-02 Current Technologies International Gmbh System, device and method for communicating over power lines
US20190334581A1 (en) * 2014-07-22 2019-10-31 Esker Technologies, LLC Transient and spurious signal filter

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